Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21061#discussion_r197005444
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -2355,3 +2355,347 @@ case class ArrayRemove(left: Expression, right:
Expression)
override def prettyName: String = "array_remove"
}
+
+object ArraySetLike {
+ def useGenericArrayData(elementSize: Int, length: Int): Boolean = {
+ // Use the same calculation in UnsafeArrayData.fromPrimitiveArray()
+ val headerInBytes =
UnsafeArrayData.calculateHeaderPortionInBytes(length)
+ val valueRegionInBytes = elementSize.toLong * length
+ val totalSizeInLongs = (headerInBytes + valueRegionInBytes + 7) / 8
+ totalSizeInLongs > Integer.MAX_VALUE / 8
+ }
+
+ def throwUnionLengthOverflowException(length: Int): Unit = {
+ throw new RuntimeException(s"Unsuccessful try to union arrays with
$length " +
+ s"elements due to exceeding the array size limit " +
+ s"${ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH}.")
+ }
+}
+
+
+abstract class ArraySetLike extends BinaryArrayExpressionWithImplicitCast {
+ override def dataType: DataType = left.dataType
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ val typeCheckResult = super.checkInputDataTypes()
+ if (typeCheckResult.isSuccess) {
+
TypeUtils.checkForOrderingExpr(dataType.asInstanceOf[ArrayType].elementType,
+ s"function $prettyName")
+ } else {
+ typeCheckResult
+ }
+ }
+
+ @transient protected lazy val ordering: Ordering[Any] =
+ TypeUtils.getInterpretedOrdering(elementType)
+
+ @transient protected lazy val elementTypeSupportEquals = elementType
match {
+ case BinaryType => false
+ case _: AtomicType => true
+ case _ => false
+ }
+}
+
+/**
+ * Returns an array of the elements in the union of x and y, without
duplicates
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(array1, array2) - Returns an array of the elements in the union
of array1 and array2,
+ without duplicates.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(1, 3, 5));
+ array(1, 2, 3, 5)
+ """,
+ since = "2.4.0")
+case class ArrayUnion(left: Expression, right: Expression) extends
ArraySetLike {
+ var hsInt: OpenHashSet[Int] = _
+ var hsLong: OpenHashSet[Long] = _
+
+ def assignInt(array: ArrayData, idx: Int, resultArray: ArrayData, pos:
Int): Boolean = {
+ val elem = array.getInt(idx)
+ if (!hsInt.contains(elem)) {
+ resultArray.setInt(pos, elem)
+ hsInt.add(elem)
+ true
+ } else {
+ false
+ }
+ }
+
+ def assignLong(array: ArrayData, idx: Int, resultArray: ArrayData, pos:
Int): Boolean = {
+ val elem = array.getLong(idx)
+ if (!hsLong.contains(elem)) {
+ resultArray.setLong(pos, elem)
+ hsLong.add(elem)
+ true
+ } else {
+ false
+ }
+ }
+
+ def evalPrimitiveType(
+ array1: ArrayData,
+ array2: ArrayData,
+ size: Int,
+ resultArray: ArrayData,
+ isLongType: Boolean): ArrayData = {
+ // store elements into resultArray
+ var foundNullElement = false
+ var pos = 0
+ Seq(array1, array2).foreach(array => {
+ var i = 0
+ while (i < array.numElements()) {
+ if (array.isNullAt(i)) {
+ if (!foundNullElement) {
+ resultArray.setNullAt(pos)
+ pos += 1
+ foundNullElement = true
+ }
+ } else {
+ val assigned = if (!isLongType) {
+ assignInt(array, i, resultArray, pos)
+ } else {
+ assignLong(array, i, resultArray, pos)
+ }
+ if (assigned) {
+ pos += 1
+ }
+ }
+ i += 1
+ }
+ })
+ resultArray
+ }
+
+ override def nullSafeEval(input1: Any, input2: Any): Any = {
+ val array1 = input1.asInstanceOf[ArrayData]
+ val array2 = input2.asInstanceOf[ArrayData]
+
+ if (elementTypeSupportEquals) {
+ elementType match {
+ case IntegerType =>
+ // avoid boxing of primitive int array elements
+ // calculate result array size
+ val hsSize = new OpenHashSet[Int]
+ Seq(array1, array2).foreach(array => {
+ var i = 0
+ while (i < array.numElements()) {
+ if (hsSize.size > ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH)
{
+ ArraySetLike.throwUnionLengthOverflowException(hsSize.size)
+ }
+ hsSize.add(array.getInt(i))
+ i += 1
+ }
+ })
+ if (UnsafeArrayData.useGenericArrayData(IntegerType.defaultSize,
hsSize.size)) {
+ ArrayUnion.evalUnionContainsNull(array1, array2, elementType,
+ if (elementTypeSupportEquals) null else ordering)
+ } else {
+ hsInt = new OpenHashSet[Int]
+ val resultArray = UnsafeArrayData.fromPrimitiveArray(new
Array[Int](hsSize.size))
+ evalPrimitiveType(array1, array2, hsSize.size, resultArray,
false)
+ }
+ case LongType =>
+ // avoid boxing of primitive long array elements
+ // calculate result array size
+ val hsSize = new OpenHashSet[Long]
+ Seq(array1, array2).foreach(array => {
+ var i = 0
+ while (i < array.numElements()) {
+ if (hsSize.size > ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH)
{
+ ArraySetLike.throwUnionLengthOverflowException(hsSize.size)
+ }
+ hsSize.add(array.getLong(i))
+ i += 1
+ }
+ })
+ if (UnsafeArrayData.useGenericArrayData(IntegerType.defaultSize,
hsSize.size)) {
+ ArrayUnion.evalUnionContainsNull(array1, array2, elementType,
+ if (elementTypeSupportEquals) null else ordering)
+ } else {
+ hsLong = new OpenHashSet[Long]
+ val resultArray = UnsafeArrayData.fromPrimitiveArray(new
Array[Long](hsSize.size))
+ evalPrimitiveType(array1, array2, hsSize.size, resultArray,
true)
+ }
+ case _ =>
+ val arrayBuffer = new scala.collection.mutable.ArrayBuffer[Any]
+ val hs = new OpenHashSet[Any]
+ var foundNullElement = false
+ Seq(array1, array2).foreach(array => {
+ var i = 0
+ while (i < array.numElements()) {
+ if (array.isNullAt(i)) {
+ if (!foundNullElement) {
+ arrayBuffer += null
+ foundNullElement = true
+ }
+ } else {
+ val elem = array.get(i, elementType)
+ if (!hs.contains(elem)) {
+ if (arrayBuffer.size >
ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH) {
+
ArraySetLike.throwUnionLengthOverflowException(arrayBuffer.size)
+ }
+ arrayBuffer += elem
+ hs.add(elem)
+ }
+ }
+ i += 1
+ }
+ })
+ new GenericArrayData(arrayBuffer)
+ }
+ } else {
+ ArrayUnion.evalUnionContainsNull(array1, array2, elementType,
+ if (elementTypeSupportEquals) null else ordering)
+ }
+ }
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val i = ctx.freshName("i")
+ val pos = ctx.freshName("pos")
+ val value = ctx.freshName("value")
+ val size = ctx.freshName("size")
+ val (postFix, classTag, getter, setter, javaTypeName, arrayBuilder) =
+ if (elementTypeSupportEquals) {
+ elementType match {
+ case ByteType | ShortType | IntegerType | LongType =>
+ val ptName = CodeGenerator.primitiveTypeName(elementType)
+ val unsafeArray = ctx.freshName("unsafeArray")
+ (if (elementType == LongType) s"$$mcJ$$sp" else s"$$mcI$$sp",
+ s"scala.reflect.ClassTag$$.MODULE$$.$ptName()",
+ s"get$ptName($i)", s"set$ptName($pos, $value)",
CodeGenerator.javaType(elementType),
+ s"""
+ |${ctx.createUnsafeArray(unsafeArray, size, elementType,
s" $prettyName failed.")}
+ |${ev.value} = $unsafeArray;
+ """.stripMargin)
+ case _ =>
+ val genericArrayData = classOf[GenericArrayData].getName
+ val et = ctx.addReferenceObj("elementType", elementType)
+ ("", s"scala.reflect.ClassTag$$.MODULE$$.Object()",
+ s"get($i, $et)", s"update($pos, $value)", "Object",
+ s"${ev.value} = new $genericArrayData(new Object[$size]);")
+ }
+ } else {
+ ("", "", "", "", "", "")
+ }
+
+ nullSafeCodeGen(ctx, ev, (array1, array2) => {
+ if (classTag != "") {
+ // Here, we ensure elementTypeSupportEquals &&
!array1.containsNull && !array2.containsNull
+ val foundNullElement = ctx.freshName("foundNullElement")
+ val openHashSet = classOf[OpenHashSet[_]].getName
+ val hs = ctx.freshName("hs")
+ val arrayData = classOf[ArrayData].getName
+ val arrays = ctx.freshName("arrays")
+ val array = ctx.freshName("array")
+ val arrayDataIdx = ctx.freshName("arrayDataIdx")
+ s"""
+ |$openHashSet $hs = new $openHashSet$postFix($classTag);
+ |boolean $foundNullElement = false;
+ |$arrayData[] $arrays = new $arrayData[]{$array1, $array2};
+ |for (int $arrayDataIdx = 0; $arrayDataIdx < 2;
$arrayDataIdx++) {
+ | $arrayData $array = $arrays[$arrayDataIdx];
+ | for (int $i = 0; $i < $array.numElements(); $i++) {
+ | if ($array.isNullAt($i)) {
+ | $foundNullElement = true;
+ | } else {
+ | $hs.add$postFix($array.$getter);
+ | }
+ | }
+ |}
+ |int $size = $hs.size() + ($foundNullElement ? 1 : 0);
+ |$arrayBuilder
+ |$hs = new $openHashSet$postFix($classTag);
+ |$foundNullElement = false;
+ |int $pos = 0;
+ |for (int $arrayDataIdx = 0; $arrayDataIdx < 2;
$arrayDataIdx++) {
+ | $arrayData $array = $arrays[$arrayDataIdx];
+ | for (int $i = 0; $i < $array.numElements(); $i++) {
+ | if ($array.isNullAt($i)) {
+ | if (!$foundNullElement) {
+ | ${ev.value}.setNullAt($pos++);
+ | $foundNullElement = true;
+ | }
+ | } else {
+ | $javaTypeName $value = $array.$getter;
+ | if (!$hs.contains($value)) {
+ | $hs.add$postFix($value);
+ | ${ev.value}.$setter;
+ | $pos++;
+ | }
+ | }
+ | }
+ |}
+ """.stripMargin
+ } else {
+ val arrayUnion = classOf[ArrayUnion].getName
+ val et = ctx.addReferenceObj("elementTypeUnion", elementType)
+ val order = if (elementTypeSupportEquals) "null"
+ else ctx.addReferenceObj("orderingUnion", ordering)
+ val method = "evalUnionContainsNull"
+ s"${ev.value} = $arrayUnion$$.MODULE$$.$method($array1, $array2,
$et, $order);"
+ }
+ })
+ }
+
+ override def prettyName: String = "array_union"
+}
+
+object ArrayUnion {
+ def evalUnionContainsNull(
--- End diff --
The method name is outdated?
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